Low Cost, Low Power Differential ADC Driver

The AD8137 is a low cost differential driver with a rail-to-rail output that is ideal for driving ADCs in systems that are sensitive to power and cost. The AD8137 is easy to apply, and its internal common-mode feedback architecture allows its output common-mode voltage to be controlled by the voltage applied to one pin. The internal feedback loop also provides inherently balanced outputs as well as suppression of even-order harmonic distortion products. Fully differential and single-ended-to-differential gain configurations are easily realized by the AD8137. External feedback networks consisting of four resistors determine the closed-loop gain of the amplifier. The power-down feature is beneficial in critical low power applications.

The AD8137 is manufactured on Analog Devices, Inc., proprietary second-generation XFCB process, enabling it to achieve high levels of performance with very low power consumption.

The AD8137 is available in the small 8-lead SOIC package and 3 mm × 3 mm LFCSP package. It is rated to operate over the extended industrial temperature range of −40°C to +125°C.

APPLICATIONS

* ADC drivers

* Portable instrumentation

* Battery-powered applications

* Single-ended-to-differential converters

* Differential active filters

* Video amplifiers

* Level shifters

* Fully differential

* Extremely low power with power-down feature

2.6 mA quiescent supply current @ 5 V

450 µA in power-down mode @ 5 V

* High Speed

* 12-bit SFDR performance @ 500 kHz

* Fast settling time: 100 ns to 0.02%

* Low input offset voltage: ±2.6 mV max

* Low input offset current:

0.45 µA max

* Differential input and output

* Differential-to-differential or single-ended-to-differential operation

* Rail-to-rail output

* Adjustable output common-mode voltage

* See data sheet for additional features